Automatic drill-milling machine



Junev 9, 192s. 1,541,549.

.-c P. wlNEMAN ET AL yAUTQMITIC DRILL MILLING MACHINE Filed March 29, 1922 6 sheetsheet 2 mili " u I l Jura? 9, 1925. 1,541,549 C. P. WINEMAN ET'AL AUTOHATIC DRILL MILLING MACHINE Filed March 29, 192.2 6 Sheets-Sheet 5 June 9,1925. 1,541,549

c; P. wlNEMAN ET Al.

AUTOMATIC DRILL MILLNG MACHINE VFiled March 29, 1922 5 Sheetsheet '4 Jime 9, 1925. -1`,'541,549

V C. P. WINEMAN- ET AL AUTOMATIC DRILL MILLING MACHINE Filed Mlh 29 1922 5 Sheets sheet 5 June 9, 41925. 1,541,549

- C. P. WINEMAN ET AL AUTOMATIC DRILL MILLING MACHINE Filed March 29, 1922 6 Sheetsheet 6 YA/079 77/.y0-.aow/93.5'I az Nada 97709 Patented June 9, 1925.

f' l 1,541.1,54e

UNITED STATES PATENT OFFICE.

CHARLES P. WINEMAN AND vVVILLIAIll/I PORATION F MICHIGAN.

G. oALKINs,

AUTMATIC DRILL-MILLING- IVIACHINE.

Application led March 29, 1922. Serial No. 547,658.

To all whom 'it may concern:

Be it known that we, lCHARLEs P. WI'Nu- MAN and VILLIAM G. CALnINs, citizens of the United States of America, residing at Detroit, in the county of vWayne and State of Michigan, have invented certain new and useful Improvements in Automatic DrilllVilling Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a machine for manufacturing twist drills and the like, and its object is to provide a machine adapted to automatically perform the flute milling operation, including the. feeding of the blank and the ejectment of the `milled blank, continuously and with a positive and accurate timed relation of the several steps in the operation.

. A further object is to facilitate changes necessary in manufacturing drills of various sizes and lengths, and to insure accuracy and uniformity of the product. It is also an object to provide a machine` which is comparatively simple in construction, compact in its arrangement, and which embodies certain other new and useful features, ail as hereinafter more fully described.

With the above and other ends in view, the invention consists inthe matters hereinafter set forth and more particularly pointed out in the appended claims, reference being had to the accompanying drawings, in which- Fig. 1 is a side elevation of a machine embodying the invention; f

Fig. 2 an end elevation of the same;

Fig. 3 a transverse section substantially upon the line 3 3 of Fig. 4;

4 is a plan view;

5 is a longitudinal vertical section substantially upon the line 4-4 of F ig. 4;

6 is a transverse section upon. the line Gnbf Fig. 5;

Fig. 7 a transverse section on the line G- -6 of Fig. 5, and

8 a developed view or diagram of a master cam or drum.

As shown in the drawings, 1 indicates a suitable supporting base orl frame which is provided with suitable bearings for a main drivev shaft 2, said drive shaft' being provided with a tight pulley 3 and a loose pulley 4 for a driving belt. Secured upon the main drive shaft 2 is a beveled pinion 5 in mesh with a beveled gear 6 secured upon the end of a countershaft 7, said countershaft being mounted in suitable bearings' upon one side ofthe frame and extending longitudinally ofthe frame at right angles to the main' driving shaft. Upon theken'd of the countershaft 7 opposite that to which the gear 6 isfsecured', isa beveled pinion 8 which is in mesh with alike pinion 9 secured upon the lower end of a vertical worm shaft 10also'inounted in bearings upon the frame 1f and extending vertically 'upward to transmit motion from the countershaft through a worm 11 on the worm shaft to a large' worm gear 12 mounted upon a stub shaft 13 near the top of the frame' A1, saidv stub shaft 13 being provided with a spur gear 14 in mesh with a large spur gear 15 secured upon a drum `shaft 16 which is mounted in suitable bearings upon the frame and extends longitudinally of the machine from, endto end thereof and at right angles to the main driving shaft 2. Motion is taken from the large worm wheel 12 through' a small worin gearr 17 for'driving a spindle 18 which is mounted within two parallel spaced bearings 19 on the frame directly above the drum shaft 16. This spindle is mounted within the bearings 19 to freely turn therein` and to: move longitudinally therethrough, lthe worm wheel 17 being mounted upon-the spindle between said bearings, which bearings hold the worm wheel OF DETROIT, MICHIGAN, AS- SIGNORS TO DETROIT TWIST DRILL COMPANY, OFY DETROIT, ylVIICIIIGiAN, A COR- against movement longitudinally upon the a longitudinal groove in the spindle. The

spindle is therefore rotated by motion transf mitted from the main driving shaft through the countershaft 7, vertical shaft y 10, and worm wheel connection, being at the same time free to move longitudinally.

To move the spindle 18 longitudinally in lits, bearings 19, a head or slide 22 is mounted within ways 23 provided atv the upper side of a suitable drum casing 24 which casing forms an'extension of the frame land is of semi-cylindrical form to conform some- -what to the shape of a master cam or drum 25 mounted upon Athe drum shaft 16 within the casing. The ways 23 extend longitudinally of the casing 24 and drum and drum shaft therein, the spindle 18 therefore in s to release the end 'of the spindle 18 and is held against longitudinal ino've-nent-withein the bearing 26 by means of a cap 27 upon the rear end of the spindle.

Motion is transmitted to the drum shaft. '16 from the' main J driving shaft' 2 through the 'coui'itershaft T, vertical shaft 10, and woi'm'gears and spur gears 14 and 15. To turn" the master cam or'druiii 25 in timed relation to thev other' parts ol' the machine hereinafter described, and to reciprocate the spindle 18 also 'in timed relation to the other movements' of the machine, a cam slot 28,',sjhown in'Figs. 5 an`d'8`of the drawis 'formed' in the surface of the drum 2o andi'engaging this cam slot is a pin or stiid`29. secured in any suitable manner to they `s'lide`22 and projecting` downwardly therefrom through the slot in the casing 2d between the ways 2B. The' rotation of the drum. therefore imparts an irregular motion hereinafterV more 'fully 'described in connection. with Fig. 8of the drawings, to move.A the slide 22 inthe ways and recipro catethe' spindle 18 longitudinally.

rl`hei'spindle 18' is tubular and within its forward" endr is located a suitable blank holding or. gripping device or chuck vvof the vusual split headJ construction, said head being forin'edconical to fitfwithin the tapered bore 8l ofthe forward end of the spindle 18'.r A small tube 32 extends longitudiiially through the spindle 18 with the forwardV endv of said tube Vsecured to the inner `Vei'id' ofthe chuck head'BO yand sleeved upon-the rear end fof thisv tube 32 between a bearing 83 within the spindlefor the .tube and a bushing secured upon the rear end ofthe tube, is a coiledspring 35 arranged to normally exert a force, to move the tube 32 longitudinally within the Aspindle 18 and bring the chuck 8() to seat within the'end'l of the spindle. ln order to move the tube loiigii'iuc'linally against the action of the spring 85 and thus project the chuck from the. spindle, in order yblank caught within the chuck, suitable does or lingers 256 'are piv` otally -attached `to the, collar ou the rear these dogs are formed. with short arms to engage the end of the tube 82 or collar thereon, and with "long arms adapted to'be received within a'recess 87 provided within a fixed block '88 secured within the slot in the top of ther-.rising 24A. between the ways 28. rlhis 87 lis of. such diameter relative to p5 Vthe `iiivotal points of the dogs 36 that when the slide 22 is moved to its rearmost position andthe spindle is 'carried thereby to` wardthe block 88, the long arms of the dogs or bell cranks '86 will enter this recess 37 and V4beA turned upon their pivots thereby, swinging the short arms vof the dogs or bell cranks forwardly against the rear end of the tube 82 and moving said Vtube loi'igitudinally against the action of the spring The drill blank 39 which may at the time beY gripped at its rear end by the chuck 80, will thus be released byv the endwise movement' of the tube 32a`ndchu`ck head and upon such release, to eject the blank from theA chuck, an ejector rod l0.

through the tube and through an VaxialV bore in the chuck head with its forward end Yin engagement with the inner Vend of the drill blank held by the chuck and to move this -rod vlongitudinally for the purpose of forcibly and quickly eje'cting the blank, a coiled spring 4l is sleeved upon the-` rod within the Achamber 37 of the block 38 between the/inner end of the chamber and a suitableIv collar l2 secured upon the rod, said rodliaving a bearing at its rear end upon the blockA 38 by said block'being formed with a bore through which the rear end ofthe rod extends and is free to reciprocate. The longitudinal inovement of the rod is `limited by provid ing a head upon the extreme rear end ofthe rod'to engage the rear side of the block 38. Wihen the' spindle Vv18 is moved toward `the block 38 tothe position shown in F ig. 5, and with a drill blank gripped and heldlby'the chuck 80, such movement of the spindle toward'the block will bring the forward end of the rod l() into engage ment with the inner end of the blank and thus the rod Vwill'be mov-ed endwise against the action of the spring Ll1, compressingsaid spring slightlyso that immediately upon the release ofthe blank-'by theNV opening -of the chuck, this spring will act to forcibly and quickly in'ove'the rod endwise and eject the blank from the chuck.

VTo automatically feed'v drill blanks 39 to the chuck 30 in timed relation to the other steps in the operation of the machine, a hopper le is provided within which hopper 'is placed supply of blanks and through the Athroat' -l5 of this hopper the blanks pass downwardly onto a slide 16 which is recip'rocable beneath the hopper, the forward end of said slide being provided with a suitable fixed bar 47 positioned directly below the hopper throat when the slide is iii retracted position and spaced from the lower end ofthe 'throat a distance equal to the diameter ofl one blank. To hold the blank in position upon this barduring the movement of the slide,.said bar is preferablyv magnetized to forma permanent .magnet and therefore, upon forward move- Ril -ment of the slide from the kposition shown in Fig. 7, one blank will be carried for ward bythe slide to a Vposition directly in line with the mouth of the Achuck 30. The movement of the slide 46 .is inaccurate timed relation to the longitudinal'movenient of the spindle 18 and these movements are so timed that when the spindle has been retracted and a finisheddrill has been ejected therefrom, as previously described, upon the spindle being again moved forward, the adjacent end of the blank will enter the chuck.l The long arms of thev dogs 36 are of such a length relative to ythe necessary forward movement of the spindle in order to carry the chuck 'a sufficient distance to fully enter the end of the blank therein, that said blank will be fully entered in the chuck before the forward movement of the spindle has withdrawn the long arms of the dogs from their recess 37, and therefore the chuck will be held open until the blank is in position therein when a further forward movement of the spindle will release the dogs or bell cranks 36 and the chuck will be closed `by the action vof the spring 35 to firmly gripl the drill blank.

This timed relationfbetween the operation of the slide 46 andthe reciprocation of the spindle 18 is secured through themounting of a cam wheel 18 upon the drum shaft 16, said cani wheel being provided to swing an operatinglever 49 upon its pivot 50, the upper end of said lever being pivotally connected at 51,- tovthe undersidel of the slide 46, a spring serving to hold the arm 49 turned toward the cam and to hold a pin l53 carried by the arm in firm engagement with the periphery of the cam wheel, which periphery is formed with 'a cam notch-'5ft therein. said notchrbeing formed with kan abrupt-shoulderat its forward end in the direction of rotation, so that the pinv` will drop oft' into the notch and permit the arm 49 to be swung quickly toward the cam by the action of the spring 52 at exactly the proper time to feed a drill blank into position in alignment with the chuck 30. The

Y notch 54 is elongated with its bottom formed concentricwith the axis of the cam sothat the slide -l-6 will reniain in forward position for a sufficient length of time to support and hold the blank while the chuck isV being moved up and operated to grip the end of the blank. Because of the particular-timing relation between reciprocation of the spindle 18 and rotation of the shaft 16, and as such reciprocation of the Vspindle is controlled by the master cam or drum 25 whichl is mounted upon the shaft 16 and the operation of the feed slide 26 isalso controlled by the cam wheel 48 upon saidshaft, these operations arerin accurate timed relation,

After the spindle 18 has 'moved forwardly and `the chuck carried thereby has gripped the. end of a blank, further forward movement ofthe spindle carries the blank eud-l wiseY into a holding block which is provided with a bore to receive the blank, said block being supported in any suitable man-V ner upon the framel 1 with its bore in accurate longitudinal alignment withthe axis of rotation of the spindle and its chuck. The upper side of the block is notchedor cut away, as indicated' at 56 in Fig. 5, to permit the periphery of a suitable millingY cutter 57 to enter the boreof the block and cut the desired depth of groove in the blank as said blank is moved forwardly through the bore of the block by the movement of the kspindle 1S. uringthis forward ino-,vement of the blank by the spindle, the spindle is being rotated in timed relation to its reciprocation by means of the worm gears 12 and 17, as previously describedand therefore a groove of the desired spiral form is cutv in the surface of the blank longitudinally thereof. Y

The cutter 57 is mounted upon an arbor which-arbor isy mounted within' a suitable bearing 59 on a carrying head 60, said Ycarrying head being provided with a bore 61 to receive a stud 62 extending vertically upward from a slide 63 mounted upon a bed v64 provided therefor on the frame 1 and held inposition and free toy be reciprocate'd upon said bed transversely of the frame by means of a rib 65l having under-cut side edges, said rib engaging a dove-tailed groove in the under side ofthe slide 63. The head 60 is also vsupported by a vertical post 66 extending vertically upward from the slide 63, said post extending through a vertical bore in a lateral extension ofthe head. The head is thus supported andcarried by the slide 63 with the'horizontally extending arbor 58 `so positioned. that theplane of rotation of the milling-cutter carried thereby will be atan angle to the axis of the blank which is being grooved, said cutter plane corresponding to the pitcher angle of the spiral groove to be cut in the blank. Motion is transmittedto the arbor 58 from the main vdriving shaft 2 byrniounting a beveled 'gear 67 upon said shaft'to turn therewith r'and to slide vlongitudinally thereon, said shaft being provided vwith asuitablespline 68 or other means affording driving connection between the shaft'and gear and permitting the gear to .slide upon the shaft, and in mesh with the gear 67 is a like beveled gear 69 upon a vertical shaft 70, said shaft and gear being carried Vby a suitable yoke 71 having a bearingupon the shaft 2 to vslide longitudi# nally thereon and carry said shaft and gear and the gear 67 with it. A bearing '72 forv vthe upper end of the shaft 70 is provided l ing the driiinggears (i7 and G9 so that they iii-ay move along the main driving shaft when fthe slide @Sis adjusted by means .-ot. a suitableadjusting screw 75, Vthe head' and cuttercarricd thereby being thus adjusted il transversely ot the trame by the movement of the carrying slide.

In the manufacture ot spiralhdrillsvit is the common practice, for` the purposeot' strength, to tormthe drill with the webinereased in. thickness toward the shank ot thewdrill, that is, the spiral groovesy are formed withV increasingly ,less depthtoward the shank olf the drill, and to automatically increase thel thickness of the web during the millingfof the groovesin theblank, the prese-nt machine .isA provided with a web increase cam 76, which is secured upon the longitudinal drnmshat 16, and to raise and .lower'thef head dcarrying themilling cutter 57 the very slight distance necessary to give the diminishing-cut toy the milling cutter -as it mills the groove toward the shank of the blank, the post or stud G2 is formed hollow or tubular and a -rod 77.is eX- tended upward through this post' with. its

lower end projecting downwardly in. the

base or frame ll adjacent the cam 76. Secured upon the lower end of this rod 77 is an arm 7 8 carrying va pin 79 at its free end to engagethe peripheral surfaceot the cam 76. The upper end of the-post or stud 62 is reduced in diameterand upon this reduced end is sleeved a .coiled spring-8O in compression between the .shoulder von the post formed by reducing the upper end ,thereofand the, inner end `oit-the bore 6l. ot the head. 60.l This. spring 80` therefore exerts; a: 'torce to normally raise-the head or slide it vertically upward upon the post and thushold the pin 7 9 in 4firm contact with theperiphery of the cam 7.6,'said head 60 being providedwith. a cap 81 which engages the.screw-threadedupward end S2 of the rod 771 and'v rests upon the upper end of the head'. A :lock nut 83 is provided yon vthe end ofthe rod-77 toffengagethe head 8O and lock the same in the .position to. which it isadjusted, such, adjustment being 'facili tated by-pro-viding a flange 84C onthe cap 8l, which flange isgraduatedy to .show the accurate adjustment of the head so .that the operator may readily and. accurately 'detervmine the proper adjustment of' the milling cutter relative to the blank to givezth'e desire-d depth of the groove. `As the web increase. 04211112176 is mounted -uponthe drum shaft 16,'4the web .increase mechanism isoperatedgin accurate timed relation to the reciprocation ot the spindle 18 and the. mill.-Y ing operation. j

A ,develogped view orv diagrammatic layout oi the master cam orf drum Qiis shown Fig. S rotI the drawings.y Vrlhe number of:

revolutions whichg'are made by' the spindle during .each rotation of the` drum is .indicated by the dotted1 lines o and .the cam groove `28 is platted Las extending trans-y versely to these linesindicatingytherevolutions ot' the spindle. lt Vwill be understood that eachdrill blank is to Vbe formed in the usual manneiywith twospiral grooves and in the present.construction one groove is' milled during one forward movement of the. spindle, the spindle is,l then indexed aroundf 'one hundred eighty1 degliGQS4 and the other flute or groove then milled in the blank. rlhe spindle-.is then returned to its original position` or the po'sitionshown in vFig. to discharge the finished' product.

Vlet'erringjto the diagram, when the pin 29 which engages Vthe caml groove and opf era-tes to reciprocate the spindle, is at posi,- tion b the parts will be in the'wposition shown in Fig. 5 and the chuck or collet 30 willbe open to receive the blank. As the drum turns and the pin proceeds along-the cam slot, the spindle isadvanced tomenter the blank therein as' atposition @the collet is closed, gripping the blank and-the blank has been moved endwise suticientlyto bring it into the block beneathA thecutter and the flute cuttingis started. At posit-ion (Z the blank has been moved endwise the de.- sired distance and the tirst'tlute has been milled, the webb increase mechanism having operated duringf this period 'to raise the head 60. the desired distanceI to gradually 'decrease the depth ofthe flute and the spindlehas. made one and one-half revolutions, thus giving the desired' spiral cut. kthe positi-ons l and e, the spindlea is retracted, withdrawing the Ablank from` the block 55 sufliciently to just clear thev milling cutter but the spindle is not retracted sutil ciently toenter the dogs in the recess 37 of the block 38 and thus release the chuck orcollet During the return movement of the `spindle from l to e, the spindle is indexed or turned so that when the. milling of the' second groove commences at@ f, said flute will be properly located inthe blank relative to the first flute. From position f 'to g, the .second'flute `is cut, andduring this period theywebincrease mechanism again operates to gradually reduce the depthv of the cut as it progresses toward the shank of ther blank. From position g, the spindle isV again retracted and returned to its original position, asshown..in':Fig. 5,

entering its dogs 36 into their releasing rel' Between cess, and opening the collet to release the finished drill, t-he ejecting rod 40 at the same time operating to forcibly eject the drill from the collet. At this point the feed cam 48 operates to project the feed slide fl@ forward and feed a new blank in the position to be caught by the collet, and the operation is repeated.

By the present arrangement, blanks are automatically fed into position to be fluted, in accurate timed relation to the reciprocation of the spindle, and the forward movement of the spindle, the rotation thereof, and the formation of the spiral iiutes are all operatively connected with the main drive shaft so that a proper timing of the several operations is insured. Further, in the pres` ent arrangement of the machine, a very compact struct-ure is secured and While but a single cam groove 28 is shown in the drumv 25, yet, it will be understood that any desired number of these cam grooves having any desired configuration to give increasing or constant spiral angle may be provided in the drum to provide for drills of various lengths, and variance in diameter of the drill blanks is provided for by the arrangement of the head 60 carrying the milling cutter. Changes may therefore be quickly made to provide for manufacture of drills of different lengths 'and diameters.

It is obvious that changes may be made in the specific form, construction, or arrangement of parts, Within the scope of the appended claims, Without departing from the spirit of the invention, and We do not therefore limit ourselves to the particular construction Shown.

Having thus fully described our invention, What We claim is 1. In a machine for fluting drillblanks, the combination With ak hopper for holding drill blanks, a milling cutter, a chuck to receive and hold a drill blank, means for rotating and moving said chuck to feed the blank held thereby longitudinally across to the cutter and to operate the chuck to open and close the same, feeding means operated in timed relation to the reciprocation and rotation of the chuck, to feed blanks, one at y a time, from said hopper laterally into the ath of reciprocating movement of said chuck, and means for moving the milling cutter in timed relation to the movement of said chuck in feeding blanks to the cutter, to regulate the depth of flute cut by the cutter. y l

2. In a machine of the character described, the combination of a milling cutter, a spindle reciprocable toward and from said cutter and adapted to receive and hold drill blanks, means for feeding drill blanks,ene at a time, laterally and into the path of reciprocation of said spindle, means for reciprocatingand rotating said spindle, and meansv for operatingsaid feeding means in timed relation to said reciprocation and rotation of said spindle.

8. In a machine of the character described, the combinationv of a milling cutter, means for rotating the cutter, a guide adjacent said cutter to receive and guide a blank fed endwise to the cutter, a spindle supported in4 longitudinal alignment With said guide, a blank holding device carried by the spindle, means for continuously rotating the spindle, means o erating in timedV relation to the rotation o the spindle for reciprocating the -spindles endWise, means operating in timed relation to the reciprocation of the spindle for feeding blanks into longitudinal alignment with the spindle and between the spindle and lcutter, and means operated by the reciprocation of the spindle for releasing the blank holding means carried thereby to release the blank.

4. In a machine of the character described, the combination of a milling cutter, a movable head upon Which the cutter is mounted, a reciprocable spindle, means for feeding drill blanks laterally into the path of said spindle in timed relation to the reciprocation and rotation of the spindle, a master cam member for reciprocating the spindle, a collet carried at one end of the spindle for receiving and holding blanks, means carried by the spindle for releasing the collet to release a blank when the spindle is retracted to the limit of its movement, means for moving the head to vary the depth of cut of the cutter, and means for rotating the spindle and the master cam member in timed relation.

5. In a machine of the character described, the combination of a milling cutter, an adjustable head for carrying and supporting said cutter, a member forming a fixed guide and a support for a drill blank and into which the blank is fed past thecutter, a reciprocable spindle for feeding blanks into said guide member longitudinally past the cutter, means for rotating the spindle, means for reciprocating the spindle in timed relation to its rotation, means operating in timed relation to the rotation and reciprocation of the spindle for moving said head during the reciprocation of said spindle and in timed relation thereto to move the cutter transversely of the blank held by said fixed supporting vmember and vary the depth of groove cut by the cutter in the blank, means for releasing the blank from the spindle at one end of the reciprocation thereof, and means operating in timed relation to the rec'iprocation of said, spindle for feedingof agslide extending transversely of tlie frame, a head carried by the slide, a milling cutter carried by the head7 means 'for rotating the cutter, a member carried by the 'frame and lorming a guide and support for blanks 'fed to the cutter, a reeiprooable spindle7 a 'eollet carried by one end ofthe spindle to receive and hold blanks7 a master cam member for reciprocating the spindle, means for rotating the spindle and the master cam member in timed relation to each other, a hopper for drill blanks, feedingmeans ior. feeding drill blanks7 one at a time, 'into' longitudinal alignment with Said `spindle between the collet end of the Vspindle V5 in testimony whereof We affix onrsigna- 20 tures in presence of two Witnesses.

CHARLES P. UNED/IAN, WILLIAM G. CALKNS. n Vvitnesses:

LEWIS E. FLANDERS, ANNA M. Domi. 

